Evidence of autumn nitrogen limitation and contribution of picoplankton to carbon fixation in Lake Tahoe
Cecily C.Y. Chang, Richard G. Petersen
1995, Canadian Journal of Fisheries and Aquatic Sciences (52) 54-62
Water samples were collected from Lake Tahoe at midlake and nearshore stations at three depths (25, 50, and 75 m, corresponding to light intensities of approximately 10, 1, and 0.1% of surface light) in May and September. The water samples were evaluated to decide the following: (1) whether carbon fixation was...
Occurrence and distribution of pesticides in streams of the Midwestern United States
D. A. Goolsby, William A. Battaglin
1995, Book chapter, Agrochemical environmental fate: State of the art
No abstract available. ...
Isotope tracers on water and solute sources in catchments
Carol Kendall, C. Sklash, Thomas D. Bullen
1995, Book chapter, Solute modelling in catchment systems
No abstract available. ...
Transport of reacting solutes in rivers and streams
Robert L. Runkel, Kenneth E. Bencala
Vijay P. Singh, editor(s)
1995, Book chapter, Environmental hydrology
In this chapter we discuss the major processes affecting solutes in rivers and streams. Here a solute is generally defined as any substance or entity that is transported downstream by the flowing waters. Under this definition, solutes may be pollutants, such as pesticides and hydrocarbons, or naturally occurring substances such...
Sea otters in the northern Pacific Ocean
James L. Bodkin, Ronald J. Jameson, James A. Estes
Edward T. LaRoe, Gaye S. Farris, Catherine E. Puckett, Peter D. Doran, Michael J. Mac, editor(s)
1995, Book chapter, Our living resources: A report to the nation on the distribution, abundance, and health of U.S. plants, animals, and ecosystems
About 250 years ago sea otters (Enhydra lutris) were distributed continuously from central Baja California, north and west along the Pacific Rim to Machatka Peninsula in Russia, and south along the Kuril Island to northern Japan (Kenyon 1969; Fig. 1a). Several hundred thousand sea otters may have occurred in the...
Climatic-change implications from long-term (1823-1994) ice records for the Laurentian Great Lakes
R. A. Assel, Dale M. Robertson, M.H. Hoff, J.H. Selgeby
1995, Annals of Glaciology (21) 383-386
Long-term ice records (1823-1994) from six sites in different parts of the Laurentian Great Lakes region were used to show the type and general timing of climatic changes throughout the region. The general timing of both freeze-up and ice loss varies and is driven by local air temperatures, adjacent...
U.S. Geological Survey yearbook, fiscal year 1994
Water Resources Division, U.S. Geological Survey
1995, Report
Volume loss and mass balance for selected physicochemical constituents in Lake Pepin, upper Mississippi River, USA
William R. Maurer, Thomas O. Claflin, Ronald G. Rada, James T. Rogala
1995, Regulated Rivers: Research & Management (11) 175-184
Lake Pepin is a large, natural riverine lake in the upper Mississippi River downstream of the Twin Cities metropolitan area and the confluence with the Minnesota River, which are sources of suspended sediments and pollutants (nutrients and potentially toxic materials). The lake has a history of water quality problems and...
Preface: Bridging the gap between theory and practice on the upper Mississippi River
Kenneth S. Lubinski
1995, Regulated Rivers: Research & Management (11) 137-138
In July 1994, the Upper Mississippi River (UMR) served as a nexus for coalescing scientific information and management issues related to worldwide floodplain river ecosystems. The objective of the conference ‘Sustaining the Ecological Integrity of Large Floodplain Rivers: Application...
Double-crested cormorants along the upper Mississippi River
E.M. Kirsch
1995, Colonial Waterbirds (18) 131-136
The Upper Mississippi River is an important habitat corridor for migratory birds and other wildlife, and it supports an important commercial and sport fishery. A study was initiated by the U.S. Fish and Wildlife Service in 1991 to describe Double-crested cormorant (Phalacrocorax auritus) distribution and abundance on the...
Feeding rate of young-of-the-year ruffe on eggs of lake whitefish
Timothy J. Desorcie, Thomas A. Edsall
1995, Journal of Freshwater Ecology (10) 225-229
We measured the feeding rate of individual (0.6-12.2 g) young-of-the-year ruffe (Gymnocephalus cernuus) on the live eggs of lake whitefish (Coregonus clupeaformis) at 3, 5, and 9 degrees C in the laboratory. These temperatures were selected because they covered the range of lake temperatures over which eggs of most Great...
Lake trout spawning habitat in the Great Lakes - a review of current knowledge
J. Ellen Marsden, John M. Casselman, Thomas A. Edsall, Robert F. Elliott, John D. Fitzsimons, William H. Horns, Bruce A. Manny, Scott C. McAughey, Peter G. Sly, Bruce L. Swanson
1995, Journal of Great Lakes Research (21) 487-497
We review existing information on lake trout spawning habitat, which might indicate whether habitat is now a limiting factor in lake trout reproductive success. Lake trout spawning habitat quality is defined by the presence or absence of olfactory cues for homing, reef location with respect to the shoreline, water depth,...
Efficiency of adaptive cluster sampling for estimating density of wintering waterfowl
D. R. Smith, M.J. Conroy, D.H. Brakhage
1995, Biometrics (51) 777-788
No abstract available....
Can Dugongs Survive in Palau?
H. Marsh, G. B. Rathbun, T. J. O'Shea, A.R. Preen
1995, Biological Conservation (72) 85-89
In August 1991 we surveyed dugongs Dugong dugon in the coastal waters of Palau using methods similar to aerial surveys conducted in 1977, 1978 and 1983. Twenty-six dugongs (including four calves) were seen, a count within the range obtained previously. The rate at which dugongs were seen per unit flight-time was lower...
Wetland and aquatic macrophytes as indicators of anthropogenic hydrologic disturbance
Douglas A. Wilcox
1995, Natural Areas Journal (15) 240-248
Hydrologic disturbance can affect wetland and aquatic macrophyte communities by creating temporal changes in soil moisture or water depth. Such disturbances are natural and help maintain wetland diversity; however, anthropogenic changes in wetland hydrology may have negative effects on wetlands. Since plant communities respond to habitat alterations, observations...
Double-crested cormorants along the Upper Mississippi River
E.M. Kirsch
1995, Colonial Waterbirds (18) 131-136
The Upper Mississippi River is an important habitat corridor for migratory birds and other wildlife, and it supports an important commercial and sport fishery. A study was initiated by the U.S. Fish and Wildlife Service in 1991 to describe Double-crested cormorant (Phalacrocorax auritus) distribution and abundance on the Upper Mississippi...
Increases in gill cytosolic corticosteroid receptor abundance and saltwater tolerance in juvenile coho salmon (Oncorhynchus kisutch) treated with growth hormone and placental lactogen
J. M. Shrimpton, R.H. Devlin, E. McLean, J.C. Byatt, E.M. Donaldson, D.J. Randall
1995, General and Comparative Endocrinology (98) 1-15
Juvenile coho salmon (Oncorhynchus kisutch) were injected with one of two recombinant bovine hormones, growth hormone (bGH; 5.0 and 0.5 μg · g-1 body wt) or placental lactogen (bPL; 5.0, 0.5, μg · g-1 body wt) to determine the effect on growth, plasma cortisol concentration, cytosolic corticosteroid receptors (CR) in the gills,...
Dose-response effects of recombinant bovine somatotrop (Posilac) on growth performance and body composition of two-year-old rainbow trout (Oncorhynchus mykiss)
M.J. Garber, K.G. DeYonge, J.C. Byatt, W.A. Lellis, D. C. Honeyfield, R.C. Bull, G.T. Schelling, R.A. Roeder
1995, Journal of Animal Science (73) 3216-3222
Two hundred rainbow trout (Oncorhynchus mykiss, mean weight 301.5 g) were allotted to four treatments with five replicates in a randomized block design to determine the dose-response effects of recombinant bovine somatotropin (rbST; PosilacTM) on growth performance and carcass composition. Treatments were sham-injected controls (S), 10 µg/g BW of rbST (L),...
Oligochaete fauna of western Lake Erie 1961 and 1982: Signs of sediment quality recovery
Don W. Schloesser, Trefor B. Reynoldson, Bruce A. Manny
1995, Journal of Great Lakes Research (21) 294-306
The oligochaete fauna at 40 stations in western Lake Erie were collected in 1982 and compared to oligochaete fauna collected similarly in 1961. A total of 34 taxa, representing 18 Tubificidae and 16 Naididae, were identified. Changes in the proportions of low, moderate, and heavy polluted sediments, as determined by...
Optimization of a liquid chromatographic method for determination of malachite green and its metabolites in fish tissues
S. M. Plakas, K.R. ELSaid, G. R. Stehly, J.E. Roybal
1995, Journal of AOAC International (78) 1388-1394
A liquid chromatographic (LC) method was adapted and optimized for the determination of malachite green and its metabolites in fish plasma and muscle. Residues in plasma were extracted with acetonitrile, the extract was evaporated to dryness, and residues were resolubilized for LC analysis. Residues in muscle were extracted with...
Influence of tank design and hydraulic loading on the behavior, growth, and metabolism of rainbow trout (Oncorhynchus mykiss)
Robert M. Ross, Barnaby J. Watten, W. F. Krise, M. N. DiLauro, R. W. Soderberg
1995, Aquacultural Engineering (14) 29-47
Subadult rainbow trout (Oncorhynchus mykiss) stocked at 48 kg/m3 (3 lb/ft3) were subjected to treatments of tank design (rectangular plug flow, circular, and cylindrical cross flow) and water exchange rate (1·5 and 2·5 exchanges/h) to determine their effects on fish behavior, growth, and metabolism. Ambient light levels and current velocities were...
Waterbird predation on fish in western Lake Erie: a bioenergetics model application
Charles P. Madenjian, Steven W. Gabrey
1995, Condor (97) 141-153
To better understand the role of piscivorous waterbirds in the food web of western Lake Erie, we applied a bioenergetics model to determine their total fish consumption, The important nesting species included the Herring Gull (Larus argentatus), Ring-billed Gull (L. delawarensis), Double-crested Cormorant (Phalacrocorax auritus), Great Blue Heron (Ardea herodias),...
Diet and feeding periodicity of ruffe in the St. Louis River estuary, Lake Superior
Derek H. Ogle, James H. Selgeby, Raymond M. Newman, Mary G. Henry
1995, Transactions of the American Fisheries Society (124) 356-369
Ruffe Gymnocephalus cernuus, a percid native to Europe and Asia, is established in the Lake Superior drainage and could have negative impacts on native fish through competition for forage and predation on fish eggs. We investigated the diet of ruffes in the 4,654-ha St. Louis River estuary in May–October 1989–1990 and...
Seasonal growth and duration of the parasitic life stage of the landlocked sea lamprey (Petromyzon marinus)
Roger A. Bergstedt, William D. Swink
1995, Canadian Journal of Fisheries and Aquatic Sciences (52) 1257-1264
We used lengths and weights of 2367 live parasitic-phase sea lampreys (Petromyzon marinus) collected from Lake Huron, 1984–1990, to calculate their mean size at half-month intervals. Growth in weight was linear during June through September; increments averaged 11.1 g per half month. Growth increased sharply in October to several times the...
The occurrence of mycoplasmas in selected wild North American waterfowl
Diana R. Goldberg, M.D. Samuel, C. B. Thomas, P. Sharp, Gary L. Krapu, J.R. Robb, K.P. Kenow, C. E. Korschgen, W.H. Chipley, M.J. Conroy, S.H. Kleven
1995, Journal of Wildlife Diseases (31) 364-371
We determined the prevalence of mycoplasma infection in breeding mallard (Anas platyrhynchos) and canvasback (Aythya valisineria) hens and their broods from the central United States (1988 to 1990); and wintering American black duck (Anas rubripes) and mallard hens from the eastern United States (1990 to 1993). Mycoplasmas were isolated by...
